Code in thumbnail.* is ported into pixmapwidget and shared with a new class
that renders the page inside the (also new) pageview that borns over the
old kpdf_pagewidget class.
This commit features a 'state of the art' working-by-chance, buggy,
segfault prone view-layout algo.. :-) maybe that's stuff to fix soon!!

svn path=/branches/kpdf_experiments/kdegraphics/kpdf/; revision=349598